CN2561162Y

CN2561162Y - Supersonic electric motor

Info

Publication number: CN2561162Y
Application number: CN 02278199
Authority: CN
Inventors: 辜承林; 李华峰
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2002-06-30
Filing date: 2002-06-30
Publication date: 2003-07-16
Anticipated expiration: 2012-06-30

Abstract

The utility model discloses an ultrasonic motor, which comprises a stator, a rotor, a bearing and an axis. The utility model is characterized in that the shape of the supporting part of the stator elastic body on the stator is inverse L-shaped. When the rotor adopts friction material, or another set of stator and rotor axial with the stator and the rotor are symmetrically arranged on the other side of the bearing, the technology effect of the utility model is better. The utility model adopts the L-shaped supporting structure to reduce the amplitude difference between the inner side and the outer side of the ring of the stator, and increase the contact area of the stator. The output torque of the motor and the contact area of the stator are in the direct ratio, thus for the thin disc type supporting structure, the supporting structure which is adopted by the utility model increases the output torque of the motor. For further increasing the output torque of the motor, the utility model adopts a double stator and double rotor structure. Two rotors use the same axis to output the torque, and the output torque of the motor is twice over the single rotor under the ideal conditions.

Description

A kind of supersonic motor

Technical field

The utility model belongs to technical field of motors, is specifically related to a kind of supersonic motor.

Background technology

(UltraSonic Motor USM) is a kind of New-type electric machine of directly being constructed by functional material to supersonic motor.It generally is made up of vibrating body (be equivalent to the stator in the existing motor, made by piezoelectric ceramic and metallic plate) and moving body (be equivalent to the rotor in the existing motor, made by friction material and metal etc.).When adding the supersonic frequency alternating voltage on the piezoelectric ceramic of vibrating body, piezoelectric ceramic utilizes inverse piezoelectric effect to produce ultrasonic vibration, this vibration can be transformed into the rotation or the linear pattern motion of moving body by the frictional force between vibrating body and moving body.Compare with existing electromagnetic motor, its outstanding advantage shows: low speed high torque, compact conformation, control performance is good, dynamic response is fast, no electromagnetic interference, noiselessness etc.(see " machine science and technology ", 1998 the 4th phases, 626-629), its stator structure schematic diagram as shown in Figure 2 for the structural representation of existing traveling-wave ultrasonic motor for Fig. 1.Its shortcoming is that the stator amplitude is little, and the rotor contact width is narrow, thereby makes its output torque little, has limited it in the individual application in big torque actuated field.In addition, motor is to come carry-over moment by sticking on one deck friction material very thin on the rotor surface.Because the wearing and tearing during operation make electrical machinery life not long.

Summary of the invention

The purpose of this utility model provides a kind of traveling-wave ultrasonic motor, and this motor has the big advantage of output torque.

Further purpose of the present utility model provides that a kind of output torque is big, the traveling-wave ultrasonic motor of long service life.

For realizing above-mentioned utility model purpose, a kind of supersonic motor comprises stator, rotor, bearing and axle, and it is characterized in that: the elastomeric support section of the stator on the described stator is shaped as the Γ type.

Make when described rotor adopts abrasives, or when the opposite side of described bearing was symmetrically arranged with the another set of stator of described stator, rotor coaxial, rotor, technique effect of the present utility model was better.

Existing traveling-wave ultrasonic motor all adopts thin collar plate shape supporting construction as shown in Figure 2, and it makes the interior outside of track ring amplitude differ bigger, has reduced the rotor contact area, and then has caused the reduction of motor output torque.And the Γ type supporting construction that the utility model adopts has reduced outside difference of vibration in the track ring, has increased the rotor contact area.The output torque of motor is directly proportional with the rotor contact area, so for thin collar plate shape supporting construction, this supporting construction that the utility model adopts has increased the motor output torque.For further increasing the motor output torque, the utility model adopts the double-stator and double-rotor structure.Two rotors use same axle output torque, and in the ideal case, the motor output torque is 2 times of single stator.

The life-span of supersonic motor is mainly determined by friction material.Present supersonic motor all is to paste on the rotor after friction material is made thin layer.Obviously, along with the wearing and tearing of frictional layer, electrical machinery life is with very fast termination.The utility model is made one with rotor and friction material, promptly makes rotor with friction material.It not only reduces technology difficulty and has simplified electric machine structure, the more important thing is the useful life that has significantly improved motor.

Description of drawings

Fig. 1 is existing supersonic motor structural representation; (wherein 1. rotors, 2. friction material, 3. stator elastomer, 4. piezoelectric ceramic, 5. bearing, 6. spring, 7. nut, 8. fixed station)

Fig. 2 is existing thin collar plate shape stator structure schematic diagram;

Fig. 3 is the stator structure schematic diagram of the utility model band Γ type transition;

Fig. 4 is the structural representation of the utility model supersonic motor;

Fig. 5 is a double stator double rotor ultrasonic motor inner structure schematic diagram.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

As shown in Figure 4, Γ type transition is as shown in Figure 3 adopted at the both ends of stator elastomer 5, and its back side is pasted with piezoelectric ceramic piece 1, constitutes stator jointly.This stator is fixed on the base plate 2 by bolt 6, and rotor 4 adopts springs 3, nut 8, bearing 9 and axle 7 to be connected with stator.This motor has the big advantage of torque.

For improving the useful life of motor, can adopt friction material, make rotor as casting nylon, polytetrafluoroethylene or other organic materials.

Shown in Figure 5 is a kind of double stator double rotor ultrasonic motor, promptly at the opposite side of bearing 9, and corresponding piezoelectric ceramic piece 1 ', stator elastomer 5 ', the rotor 4 ' of being symmetrically arranged with, and be connected on the axle 7 by spring 3 ' and nut 8 '.Motor shown in Figure 5 is compared with motor shown in Figure 4, and it uses the coaxial output torque of double-stator and double-rotor, and its torque further increases.

The supersonic motor of two stator rotor structures can adopt following method to make: metal (stainless steel or copper) is processed into Γ type intermediate shape shown in Figure 3, be stator elastomer 5,5 ', its back side (the no flank of tooth) pasted piezoelectric ceramic piece 1 and 1 ' and made stator.By bolt 6 two stators and base plate 2 are linked together.Friction material is processed into rotor, and couples together with stator by spring 3,3 ', nut 8, bearing 9.In the present embodiment, stator outer diameter 80mm, internal diameter 60mm, thick 3mm, tooth depth 2.3mm, Γ type transition L ₁7mm.Stalling torque is greater than 2N.m, and useful life can be above 10,000 hours.

Claims

1. a supersonic motor comprises stator, rotor, bearing and axle, and it is characterized in that: the elastomeric support section of the stator on the described stator is shaped as the Γ type.

2. supersonic motor according to claim 1 is characterized in that: described rotor is made by abrasives.

3. supersonic motor according to claim 1 and 2 is characterized in that: the opposite side of described bearing is symmetrically arranged with another set of stator, the rotor with described stator, rotor coaxial.